Abstract
A full-length cDNA sequence was isolated from kidney total RNA of di(2-ethylhexyl) phthalate-treated sea bass by reverse-transcriptase polymerase chain reaction and then rapid amplification of cDNA ends. The deduced amino acid sequence, which has been named CYP4T2, shared 69 and 54.4% amino acid identity with rainbow trout CYP4T1 and rat CYP4B1, respectively. RNA blot analysis using the CYP4T2 cDNA as a probe indicated that the mRNA was rather abundant in kidney, and less so in liver, small intestine, and brain. Treatment of sea bass with peroxisome proliferators showed marked tissue-specific induction. CYP4 inducers clofibrate, di(2-ethylhexyl) phthalate (DEHP), and 2,4-dichlorophenoxy acetic acid (2,4-D) were administered by intraperitoneal injection. The strongest induction was found in kidney after a DEHP treatment (6.5-fold) or a 2,4-D treatment (9-fold), while no induction was observed in liver.
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